Apparatus

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sensors Mode-S transponder

A4C3E4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N406KZ · BOEING 747-400 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A4C3E4
Octal
51141744
Decimal
10,798,052
Country
US
Tail
N406KZ
Type
B744
No current signal · last broadcast 2d ago
Flights observed
182
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A4C3E4.

Country allocation

The ICAO 24-bit address A4C3E4 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
GTI7172 - 32 2026-07-08
GTI7134 - 32 2026-07-10
GTI7171 - 23 2026-07-09
GTI7143 - 16 2026-07-10
GTI7138 - 13 2026-06-24
GTI7243 Atlas Air 10 2026-06-22
GTI7147 - 9 2026-06-24
GTI7244 Atlas Air 7 2026-06-22
GTI7108 Atlas Air 7 2026-06-08
GTI7101 Atlas Air 7 2026-06-09
GTI7106 Atlas Air 5 2026-06-18
GTI7103 Atlas Air 5 2026-06-19
GTI7136 - 4 2026-06-25
GTI7174 - 2 2026-06-28
GTI7145 - 2 2026-06-26
GTI7132 Atlas Air 2 2026-04-22
GTI9706 Atlas Air 1 2026-05-12
GTI9705 Atlas Air 1 2026-05-02
GTI9180 - 1 2026-07-11
GTI7173 Atlas Air 1 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 GTI9180 - Jul 11, 10:35 UTCJul 11, 12:30 UTC1h 55m
2026-07-10 GTI7143 ORD → NRT Jul 10, 18:05 UTCJul 11, 06:05 UTC12h 1m
2026-07-10 GTI7134 ANC → ORD Jul 10, 07:15 UTCJul 10, 12:35 UTC5h 20m
2026-07-09 GTI7134 - Jul 9, 22:40 UTCJul 10, 05:00 UTC6h 20m
2026-07-09 GTI7171 DFW → NRT Jul 9, 00:30 UTCJul 9, 12:45 UTC12h 15m
2026-07-08 GTI7172 ANC → DFW Jul 8, 15:55 UTCJul 8, 21:25 UTC5h 30m
2026-07-08 GTI7172 - Jul 8, 07:15 UTCJul 8, 13:55 UTC6h 40m
2026-07-07 GTI7143 ORD → NRT Jul 7, 16:40 UTCJul 8, 04:30 UTC11h 50m
2026-07-07 GTI7134 ANC → ORD Jul 7, 08:20 UTCJul 7, 13:50 UTC5h 30m
2026-07-06 GTI7134 - Jul 6, 23:45 UTCJul 7, 06:00 UTC6h 15m
2026-07-06 GTI7171 - Jul 6, 09:10 UTCJul 6, 21:20 UTC12h 10m
2026-07-05 GTI7172 ANC → DFW Jul 5, 20:50 UTCJul 6, 02:20 UTC5h 30m
2026-07-05 GTI7172 - Jul 5, 11:35 UTCJul 5, 17:50 UTC6h 15m
2026-07-04 GTI7144 ORD → NRT Jul 4, 21:05 UTCJul 5, 08:45 UTC11h 40m
2026-07-04 GTI7134 - Jul 4, 16:50 UTCJul 4, 17:55 UTC1h 5m
2026-07-02 GTI7134 ANC → CVG Jul 2, 21:50 UTCJul 3, 04:05 UTC6h 15m
2026-07-02 GTI7134 - Jul 2, 13:50 UTCJul 2, 20:00 UTC6h 10m
2026-07-01 GTI7171 DFW → NRT Jul 1, 16:55 UTCJul 2, 05:15 UTC12h 20m
2026-07-01 GTI7172 ANC → DFW Jul 1, 08:40 UTCJul 1, 14:20 UTC5h 40m
2026-07-01 GTI7172 NRT → ANC Jul 1, 00:40 UTCJul 1, 06:50 UTC6h 10m
2026-06-29 GTI7143 - Jun 29, 21:19 UTCJun 30, 09:20 UTC12h 0m
2026-06-29 GTI7134 - Jun 29, 11:29 UTCJun 29, 17:10 UTC5h 40m
2026-06-29 GTI7134 - Jun 29, 03:10 UTCJun 29, 09:14 UTC6h 5m
2026-06-28 GTI7173 DFW → NRT Jun 28, 12:25 UTCJun 29, 00:24 UTC12h 0m
2026-06-28 GTI7174 - Jun 28, 03:19 UTCJun 28, 08:39 UTC5h 20m
2026-06-27 GTI7174 - Jun 27, 00:14 UTCJun 27, 06:25 UTC6h 10m
2026-06-26 GTI7145 - Jun 26, 09:05 UTCJun 26, 21:30 UTC12h 25m
2026-06-25 GTI7136 ANC → ORD Jun 25, 17:25 UTCJun 25, 22:54 UTC5h 30m
2026-06-25 GTI7136 - Jun 25, 08:40 UTCJun 25, 14:59 UTC6h 20m
2026-06-24 GTI7147 ORD → NRT Jun 24, 18:09 UTCJun 25, 06:25 UTC12h 15m
2026-06-24 GTI7138 ANC → ORD Jun 24, 09:49 UTCJun 24, 15:09 UTC5h 20m
2026-06-23 GTI7138 - Jun 23, 23:39 UTCJun 24, 06:04 UTC6h 25m
2026-06-23 GTI7145 - Jun 23, 09:20 UTCJun 23, 21:20 UTC12h 0m
2026-06-22 GTI7136 ANC → ORD Jun 22, 19:00 UTCJun 23, 00:30 UTC5h 30m
2026-06-22 GTI7136 - Jun 22, 10:30 UTCJun 22, 16:50 UTC6h 20m
2026-06-22 GTI7244 TPE → NRT Jun 22, 04:44 UTCJun 22, 07:34 UTC2h 50m
2026-06-22 GTI7243 NRT → TPE Jun 22, 01:15 UTCJun 22, 01:40 UTC25m
2026-06-21 GTI7243 NRT → TPE Jun 21, 22:49 UTCJun 22, 00:04 UTC1h 15m
2026-06-20 GTI7143 - Jun 20, 18:14 UTCJun 21, 05:59 UTC11h 45m
2026-06-20 GTI7134 ANC → ORD Jun 20, 09:24 UTCJun 20, 14:29 UTC5h 5m
2026-06-19 GTI7134 - Jun 19, 22:55 UTCJun 20, 05:29 UTC6h 35m
2026-06-19 GTI7103 LAX → NRT Jun 19, 02:19 UTCJun 19, 12:29 UTC10h 10m
2026-06-18 GTI7106 NRT → LAX Jun 18, 10:25 UTCJun 18, 20:10 UTC9h 45m
2026-06-17 GTI7171 DFW → NRT Jun 17, 17:55 UTCJun 18, 06:30 UTC12h 35m
2026-06-17 GTI7172 ANC → DFW Jun 17, 09:45 UTCJun 17, 14:50 UTC5h 5m
2026-06-17 GTI7172 - Jun 17, 00:15 UTCJun 17, 06:30 UTC6h 15m
2026-06-16 GTI7143 ORD → NRT Jun 16, 09:00 UTCJun 16, 21:20 UTC12h 21m
2026-06-15 GTI7134 ANC → ORD Jun 15, 22:25 UTCJun 16, 03:30 UTC5h 5m
2026-06-15 GTI7134 - Jun 15, 13:45 UTCJun 15, 20:04 UTC6h 20m
2026-06-15 GTI7244 TPE → NRT Jun 15, 08:35 UTCJun 15, 11:10 UTC2h 35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N406KZ page for operator, model, and routing details .

Mode-S A4C3E4 frequently asked

What is Mode-S code A4C3E4?
A4C3E4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N406KZ.
Where is Mode-S A4C3E4 registered?
Mode-S code A4C3E4 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4C3E4 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C3E4, octal 51141744, decimal 10,798,052.
What flights does A4C3E4 operate?
Mode-S A4C3E4 has broadcast 20 distinct callsigns, including GTI7172, GTI7134, GTI7171, GTI7143, GTI7138.